________ in the mountains for a week, the two students were finally saved by the local police．

A．Having lost

B．Lost

C．Being lost

D．Losing

He glanced over at her, ________ that though she was tiny, she seemed very well put together．

A．having noted

B．noted

C．to note

D．noting

－How do you deal with the disagreement between the company and the customers?

－The key ________ the problem is to meet the demand ________ by the customers．

A．to solving; making

B．to solving; made

C．to solve; making

D．to solve; made

You can make yourself ________ in English pretty well if you keep on speaking the language．

A．understand

B．understanding

C．to understand

D．understood

After his journey from abroad, Richard Jones returned home ________．

A．exhausting

B．exhausted

C．being exhausted

D．having exhausted

________ is thought, he almost ran into the car in front of him．

A．Losing

B．Having lost

C．Lost

D．To lose

John rushed out in a hurry, ________ the door ________．

A．leaving; unlocked

B．leaving; unlocking

C．left; unlocking

D．to leave; unlocking

Friendship is like money easier made than ________．

A．kept

B．to be kept

C．to keeping

D．being kept

She was glad to see her child well ________ care of．

A．take

B．to be taken

C．taken

D．taking

With ________ leaves ________ in the earth every year, the soil becomes richer and richer．

A．falling; burying

B．fallen; buried

C．fallen; burying

D．falling; buried